Buzz Aldrin

Unless you have been hiding under a rock, you know by now that the sun and the moon will be the stars of the Great American Eclipse of 2017. It happens Aug. 21, when the moon will pass between the sun and Earth, and, depending on where you are in the United States and a few other countries, the moon can be seen completely, or partially, blocking the sun.

But how much do you really know - or how much do you remember from science class - about the sun and moon, both of which make life on Earth possible?

What is the sun made of? How big and hot is it? How old is it, where did it come from, and when will it die?

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Unless you have been hiding under a rock, you know by now that the sun and the moon will be the stars of the Great American Eclipse of 2017. It happens Aug. 21, when the moon will pass between the sun and Earth, and, depending on where you are in the...

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